(Updates numbers of those displaced and killed)
By Zarir Hussain
GUWAHATI, INDIA, July 17 (Reuters) - Millions of people are stranded by flooding in northeast India with concern growing about food and water supplies, and officials said on Wednesday that water levels of a major river were rising even further.
At least 5.8 million people have been displaced - a million more than on Monday - and some 30 have died in the past two weeks in the tea-growing state of Assam due to the monsoon rains, local government officials said.
"The water level of the Brahmaputra and its tributaries have started showing a rising trend since midday and flowing above the danger mark in at least 10 places," an Assam Disaster Management Authority official said.
Many thousands in the state are making do with only the most meagre food supplies and dirty water.
"We've just been surviving on boiled rice for almost seven days now," said Anamika Das, a mother at Amtola relief camp in Assam's Lakhimpur district.
She said she was having difficulty breastfeeding her baby boy.
Assam has been the worst-affected part of India. Floods have also hit neighbouring Nepal and Bangladesh.
At least 153 people have been killed in India, Nepal and Bangladesh. Parts of Pakistan have also seen flooding.
Subhas Bania, also sheltering at Amtola, said authorities had made no provision for the supply of drinking water.
"We've been forced to drink muddy water," he said.
The rains in north India usually last from early June to October, with the worst of the flooding usually later in the season.
Assam is frequently swamped by floods when the Brahmaputra river, which flows down from the Himalayas through northeast India and Bangladesh, sweeps over its banks.
Water levels on the river and its major tributaries were beginning to fall, although they were still above the danger mark, the government said.
"We're trying our best to reach out to the affected people in whatever way possible but yes, the situation is indeed very bad," said Assam's Social Welfare Minister Pramila Rani Brahma.
The government has yet to assess the impact of the floods that have battered thousands of settlements.
Bhabani Das, a village elder in Golaghat district, who has been living under a plastic sheet for four days, said the flood had swept away his home.
"Where do we go from here?"
In the state of Bihar, which has also been hit by severe flooding, beginning last week, officials said that flood waters were beginning to recede after killing 33 people.
"Things are gradually becoming normal, people are returning home," Bihar's Disaster Management Minister Lakshmeshwar Roy said.
Water levels in four rivers in Bangladesh, including the Brahmaputra, were above the danger mark, with some northern parts of the low-lying country flooded.
Road and railway links between the capital city Dhaka and at least 16 northern and northwest districts had been severed, officials said. (Reporting Zarir Hussain in GUWAHATI, Jatindra Dash in BHUBANESWAR, Serajul Quadir in DHAKA; Writing by Devjyot Ghoshal Editing by Sanjeev Miglani, Robert Birsel, Peter Graff)
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